These few things can make your life amazing.
-Focus cast bar
-Marco that reads /cast [@focus] Arcane Blast
-setting rageface to focus.
Now you can see when he is raging and in one button you can 'normally' break it.
Also due to the fact that arcane breaks rage alot get the glyph of frost armor. And set up a macro to read
/castsequence mage armor, frost armor
then you can toggle armors in one button and still get decent (not totally fail) regen, while not getting your clothy face raped by a dog.